Sorter

x,y,z=1,1,0
dir=0
smeltables={
	"minecraft:iron_ore",
	"minecraft:gold_ore",
	"thermalfoundation:ore",
	"railcraft:ore_metal",
	"railcraft:ore_metal_poor"
}
furnaces=5

function Forward()
	while not turtle.forward() do end
	if (dir%2)==0 then y=y-1+(dir%4)
	else x=x+2-(dir%4)
	end
end

function Up()
	while not turtle.up() do end
	z=z+1
end

function Down()
	while not turtle.down() do end
	z=z-1
end

function Right()
	turtle.turnRight()
	dir=(dir+1)%4
end

function Left()
	turtle.turnLeft()
	dir=(dir-1)%4
end

function CheckSmeltable(num)
	local data=turtle.getItemDetail(num)
	if data then
		for i=1,#smeltables do
			if data.name==smeltables[i] then return true end
		end
	end
	return false
end

function MoveToFurnace()
	Right() Right() Forward() Left()
	local tries=0
	while not turtle.dropDown() and tries<furnaces-1 do
		Forward()
		tries=tries+1
	end
	Right() Right()
	for i=1,tries do Forward() end
	Right() Forward()
end

function MoveToChest()
	Right() Forward()
	local data=turtle.getItemDetail()
	if data and data.name=="minecraft:cobblestone" then
		Left()
		turtle.drop()
		Left() Forward() Right()
	else
		local tries=0
		while not turtle.drop() do
			Up()
			tries=tries+1
		end
		for i=1,tries do Down() end
		Right() Right() Forward() Right()
	end
end

while true do
	while turtle.suckDown() do end
	for i=1,16 do
		turtle.select(i)
		if turtle.getItemCount(i)>0 then
			if CheckSmeltable(i) then MoveToFurnace()
			else MoveToChest()
			end
		end
	end
	turtle.select(1)
end